The last few years have seen any number of social movements, many prompted through social networks. Some catch fire, and some don’t, and the role of the mainstream media is still at the heart of the matter.

Dan Kennedy teaches journalism at Northeastern University.

Callie Crossley hosts WGBH News' Under the Radar.

Kara Millerhosts WGBH News' Innovation Hub.

Jon Keller is a political analyst at WBZ.